Determining the Functional Oligomeric State of Membrane- Associated Protein Oligomers Forming Membrane Pores on Giant Lipid Vesicles

0572771 - ÚFCH JH 2024 RIV US eng J - Journal Article
Singh, Vandana - Macharová, Sabína - Riegerová, Petra - Steringer, J. P. - Mueller, H. - Lolicato, F. - Nickel, W. - Hof, Martin - Šachl, Radek
Determining the Functional Oligomeric State of Membrane- Associated Protein Oligomers Forming Membrane Pores on Giant Lipid Vesicles.
Analytical Chemistry. Roč. 95, č. 23 (2023), s. 8807-8815. ISSN 0003-2700. E-ISSN 1520-6882
R&D Projects: GA ČR(CZ) GC20-01401J
Institutional support: RVO:61388955
Keywords : Cell culture * Fibroblasts * Membranes
OECD category: Physical chemistry
Impact factor: 7.4, year: 2022
Method of publishing: Open access

Several peripheral membrane proteins are known to form membrane pores through multimerization. In many cases, in biochemical reconstitution experiments, a complex distribution of oligomeric states has been observed that may, in part, be irrelevant to their physiological functions. This phenomenon makes it difficult to identify the functional oligomeric states of membrane lipid interacting proteins, for example, during the formation of transient membrane pores. Using fibroblast growth factor 2 (FGF2) as an example, we present a methodology applicable to giant lipid vesicles by which functional oligomers can be distinguished from nonspecifically aggregated proteins without functionality. Two distinct populations of fibroblast growth factor 2 were identified with (i) dimers to hexamers and (ii) a broad population of higher oligomeric states of membrane associated FGF2 oligomers significantly distorting the original unfiltered histogram of all detectable oligomeric species of FGF2. The presented statistical approach is relevant for various techniques for characterizing membrane-dependent protein oligomerization.
Permanent Link: https://hdl.handle.net/11104/0343342